Question 373243
{{{p=2(W+L)}}}
{{{P=40}}}
{{{L=2+W}}}
<p>
{{{40=2(W+(2+W))}}} divide by 2
{{{20=2W+2}}} subtract 2
{{{18=2W}}} divide by 2
{{{9=W}}}
<p>
{{{L=2+W}}} substitute W for 9
{{{L=11}}}